bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide/src/interpret_function.rs')
-rw-r--r--crates/ide/src/interpret_function.rs46
1 files changed, 46 insertions, 0 deletions
diff --git a/crates/ide/src/interpret_function.rs b/crates/ide/src/interpret_function.rs
new file mode 100644
index 0000000000..cbcbb4b09d
--- /dev/null
+++ b/crates/ide/src/interpret_function.rs
@@ -0,0 +1,46 @@
+use hir::Semantics;
+use ide_db::base_db::SourceDatabaseExt;
+use ide_db::RootDatabase;
+use ide_db::{base_db::FilePosition, LineIndexDatabase};
+use std::{fmt::Write, time::Instant};
+use syntax::TextRange;
+use syntax::{algo::find_node_at_offset, ast, AstNode};
+
+// Feature: Interpret Function
+//
+// |===
+// | Editor | Action Name
+//
+// | VS Code | **rust-analyzer: Interpret Function**
+// |===
+pub(crate) fn interpret_function(db: &RootDatabase, position: FilePosition) -> String {
+ let start_time = Instant::now();
+ let mut result = find_and_interpret(db, position)
+ .unwrap_or_else(|| "Not inside a function body".to_string());
+ let duration = Instant::now() - start_time;
+ writeln!(result, "").unwrap();
+ writeln!(result, "----------------------").unwrap();
+ writeln!(result, " Finished in {}s", duration.as_secs_f32()).unwrap();
+ result
+}
+
+fn find_and_interpret(db: &RootDatabase, position: FilePosition) -> Option<String> {
+ let sema = Semantics::new(db);
+ let source_file = sema.parse(position.file_id);
+
+ let item = find_node_at_offset::<ast::Item>(source_file.syntax(), position.offset)?;
+ let def = match item {
+ ast::Item::Fn(it) => sema.to_def(&it)?,
+ _ => return None,
+ };
+ let span_formatter = |file_id, text_range: TextRange| {
+ let line_col = db.line_index(file_id).line_col(text_range.start());
+ let path = &db
+ .source_root(db.file_source_root(file_id))
+ .path_for_file(&file_id)
+ .map(|x| x.to_string());
+ let path = path.as_deref().unwrap_or("<unknown file>");
+ format!("file://{path}#{}:{}", line_col.line + 1, line_col.col)
+ };
+ Some(def.eval(db, span_formatter))
+}